Jar-cap.



G. A. BROSIUS.

JAR CAP.

APPLICATION FILED MAY 11. 1915.

Patented June 6, 1916.

ST TES PATENT oFFrcn.

GEORGE A. BBOSIUS, OF RAUGHTOWI T, PENNSYLVANIA.

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for an object to provide an improved construction which may be readily unscrewed whenever desired;

Another object in view is to provide a cap having a removable plate or wire which when removed will release the tension of the cap and thereby allow the same to become unscrewed without unusual effort.

A still further object of the invention is to provide a cap arranged with a flexible covering plate which normally 1s convex but will respond to the action of vacuum and move to a concave position when the vacuum in the jar has reached a certain ten- SlOIl.

In the accompanying drawings: Fi ure 1 is a section through the upper part 0 a jar and a cap embodying the invention; Fig. 2

is a view similar to Fig. 1 except that the flexible plate at the cap is shown in a de pressed or concave position; Fig. 3, is a top plan view of the cap shown in Fig. 1; Fig. 4 is a view similar to Fig. 3 but disclosing a slightly modified form of the invention.

Referring to the accompanying drawings by numeral, 1 indicates a jar, bottle or other receptacle of any desired kind having a threaded neck 2 for receiving the threads 3 of a cap 4. The cap 4 is provided with an overhanging flange 5 to which is pivotally mounted the swinging arc-shaped plate6 having an operatingextension 7 upstanding therefrom. Theextension 7 normally fits into a notch 15 whenthe cap 4 is in use. Arranged in cap 4 is a-washer 8 of any unusual or preferred structure, and between the washer 8 andflange 5 is arranged the thickened edges 9 of a plate 10. Plate 10 is made comparatively thin from the annular indentation or groove 11 so as to respond to the action of a vacuum when the same reaches a certain tension. When anything hot is placed in a jar and the cap is screwed in place thereon until the jar is airtight, a vacuum will usually be formed in the jar as soon as the article placed in Specification of Letters Patent.

Patented June 6, 1916.

Application filed m 11, 1915. Serial No. 37,354.

the jar has become cold. This creates a tension on the sides of the jar and cap and sometimes may be objectionable. to overcome all or most of this vacuum the flexible plate. 10 is provided which will automatically bow downwardly, as'shown in Fig. 2, and destroy the vacuum without admitting any air into the jar.

In applying a cap the same is screwed down tight, as shown in Fig. 3, whereupon washer 8 is compressed and makes a tight joint while the plate 10 is held rigidly in place, although the center is allowed a movement as just described. When it is desired to removethe cap, member"? is operated by a suitable pull orpush until the plate-6 moves to the dotted line position shown in F ig. 3. This will relieve the tension on the washer 8 and will thus allow the cap to be unscrewed without any considerable effort.

In Fig. 4 a slightly modified form of a cap releasing means is shown. In this form of the invention a wire or rod 12 is provided which is formed with a loop 13 arranged normally in notch 14. When it is desired to remove the cap shown in Fig. 4, loop 13 is grasped and the various parts moved to the position shown in dotted lines in said figure, whereupon the parts will become loosened and the cap may easily be removed without the use of instruments.

It is evident that the members 5 and 12 as for instance,'tinned sheet iron, aluminium or other comparatively cheap material which presents a sufficiently flexible nature to answer the purpose intended. When the.

plate 10 moves from the position shown in Fig. 2 the same will naturally press somewhat against the inner edgeof the gasket or Preferably plate. 10 is made from some form of sheet metal,

In order packing ring 8 and thereby provide an evenbetter aifprooffjoint.

What I claim is Y .In a cap of the character described,a body provided with an annular flange, a gasket arranged below said flange, a plate 'ar-,

ranged between said gasket and said flange, said plate being formed thin centrally so as I toproduce a central'flexible portion vin orderto respondtoatmospheric pressure, and a pivotally mounted filling member connected with said body and normally arranged name to this specification in the presence of two subscrlblng Witnesses.

GEORGE A. BRQSIUS.

Witnesses:

C. M. MEIXEL, H. E. SMITH. 

